I agree with @Buckeyebowman. I was practising my swing on the range yesterday and was putting some business card in front of the ball. Very pure ballstriking almost no mishits, straight ballflight I swept the card away every the time. I was focusing on my swing and the card. Then we got on the court. First hole perfect ball striking I was able to focus behind the ball and on my swing. Then second hole I made a mistake with my driver (know the reason now). But anyway my confidence was getting smaller. 200m to the hole. So I got my hybrid out "I have to hit this ball 200m very hard now". I still tried to focus behind the ball and the shot was OK. But far from perfect. From now on from hole to hole ball striking got worse. At the end I even hit in the ground in front of the ball with my sand wedge which never has happened to me before. My head was going "You have to hit this ball now!" No loose swings as on the range before. And no thinking about the loose swing going to the target. The more frustrated I got the more I focussed on the ball.
I was noticing in the end I was focussing in front of the ball and on my swing but when I made the actual downswing my eyes got back to the ball which leaded to terrible shots. I noticed the eyes really jumped.
What this means to me. I have to practise to change my focus now every time on the range and make this a priority. I also tried widening my focus which really helped. But its a different task to this on the actual court it seems.
I'm a member at the club where Xander grew up playing, obviously everyone is super excited to see him get this win and launch himself into "elite" status on tour. He won 1.58M and an extra 2M for finishing 3rd in Fed Ex Cup. This time last year he was playing in the Web.com finals.